Jesus said, greater is He in us, than he in the world. Through Jesus we are the children of God, and Jesus name is given to God's children as power over all sin.

Romans 10:9
That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, THOU SHALT BE SAVED.

First allow Jesus into your life, and then pray to God in Jesus name that these voices you hear subside, and that God protect you from evil. I give this advice because accepting Jesus is the only way to receive the Holy Ghost. Evil spirits will not stand against the Spirit of God.

It seems you are trying to fight demons directly, allow God to deliver you from them, the fight is not yours, other than the fight of faith through prayer and knowledge of your spiritual rights. Satan and his demons are bullies, do not play by their rules, play by the principals and strength of the Word of God.

Jesus said:

Matthew 11:30
For my yoke [is] easy, and my BURDEN IS LIGHT.